package com.xgp.add;

import java.util.concurrent.CountDownLatch;

/**
 * 减法计数器
 */
public class CountDownLatchDemo {
    public static void main(String[] args) throws InterruptedException {
        //总数是6，必须在执行任务的时候在使用
        CountDownLatch countDownLatch = new CountDownLatch(6);

        for(int i = 1;i <= 6;i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + "GO OUT");
                countDownLatch.countDown();     //-1
            },String.valueOf(i)).start();
        }
        countDownLatch.await();     //等待计数器归零，然后再向下执行
        System.out.println("===============");
    }
}
